66173401 has 16 divisors (see below), whose sum is σ = 80839296. Its totient is φ = 52874496.

The previous prime is 66173399. The next prime is 66173407. The reversal of 66173401 is 10437166.

It is a cyclic number.

It is not a de Polignac number, because 66173401 - 2¹ = 66173399 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66173401.

It is not an unprimeable number, because it can be changed into a prime (66173407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10135 + ... + 15331.

It is an arithmetic number, because the mean of its divisors is an integer number (5052456).

Almost surely, 2^66173401 is an apocalyptic number.

It is an amenable number.

66173401 is a deficient number, since it is larger than the sum of its proper divisors (14665895).

66173401 is a wasteful number, since it uses less digits than its factorization.

66173401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5328.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 66173401 is about 8134.7034979770. The cubic root of 66173401 is about 404.4776092642.

The spelling of 66173401 in words is "sixty-six million, one hundred seventy-three thousand, four hundred one".